TV-Series
Description
Ako Udagawa is a second-year student in Class 2-A at Haneoka Girls' Academy and the drummer for the band Roselia. Standing at 148 cm tall, she is the shortest Roselia member. She possesses long, naturally curly light purple hair meticulously styled into curled pigtails with straightened bangs and matching forelocks. Her eyes are sharp crimson, and she is frequently depicted with a fanged tooth. Her casual attire blends punk and gothic elements with a cute flair.

Ako exhibits pronounced chuunibyou tendencies, engaging in illusions of grandeur and references to magical powers—a trait her best friend Rinko Shirokane attributes to her frequent online gaming. Despite these fantasies, she maintains a realistic mindset and embraces her role enthusiastically. She is inherently cheerful, energetic, and sociable, though her attempts at dramatic speech sometimes falter due to limited vocabulary. Within Roselia, she is treated as a younger sister figure due to her childlike demeanor, despite the small age gap. Her hobbies include seeking out "cool" trends, playing Neo Fantasy Online (where she mains the Necromancer class), enjoying horror stories, haunted houses, and fireworks. She dislikes eggs, peppers, and sea cucumber, while favoring potato chips and jelly beans. Ako is also a skilled swimmer.

She deeply admires her older sister, Tomoe Udagawa, who inspired her to take up drumming to emulate her coolness. This admiration extends to her bandmate Yukina Minato, whom she idolizes to the point of visible excitement during interactions. Her closest friend is Rinko Shirokane ("Rin-rin"), whom she met through Neo Fantasy Online; their bond includes physical affection and shared gaming sessions. She is classmates with Asuka Toyama and Rokka Asahi.

Initially, Ako struggled with feelings of inadequacy as a drummer and sought ways to appear "cooler." Early interactions saw bandmates like Yukina and Sayo Hikawa dismissing or ignoring her chuunibyou expressions. Over time, she gained confidence through dedication to drumming—though she admits difficulty reading sheet music—and her bandmates gradually accepted her unique traits. Sayo later became a fellow Neo Fantasy Online player. Ako’s focus on "coolness" influences Roselia’s aesthetic decisions, and her perspective occasionally guides the band creatively. Her growth is marked by increased self-assurance in both her musical role and personal identity.

Her birthday is July 3, making her a Cancer. Her surname "Udagawa" combines the characters for "universe," "paddy field," and "river," while her given name "Ako" carries no inherent meaning in Japanese.